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Transport and Mixing With Swimming Microorganisms in Chaotic Flows- [electronic resource]
Transport and Mixing With Swimming Microorganisms in Chaotic Flows - [electronic resource]
Transport and Mixing With Swimming Microorganisms in Chaotic Flows- [electronic resource]

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자료유형  
 학위논문파일 국외
최종처리일시  
20240214101244
ISBN  
9798380384674
DDC  
530
저자명  
Ran, Ranjiangshang.
서명/저자  
Transport and Mixing With Swimming Microorganisms in Chaotic Flows - [electronic resource]
발행사항  
[S.l.]: : University of Pennsylvania., 2023
발행사항  
Ann Arbor : : ProQuest Dissertations & Theses,, 2023
형태사항  
1 online resource(111 p.)
주기사항  
Source: Dissertations Abstracts International, Volume: 85-03, Section: B.
주기사항  
Advisor: Arratia, Paulo E.
학위논문주기  
Thesis (Ph.D.)--University of Pennsylvania, 2023.
사용제한주기  
This item must not be sold to any third party vendors.
초록/해제  
요약Microorganisms, primitive unicellular forms of life, form the basis of the food web and play crucial roles in the Earth's biogeochemical cycles. Habitats of microorganisms, from oceans and lakes to soil and human intestines, are often characterized by constant fluid motion. Fluid flow exerts forces and torques on microorganisms that affect their movement and distribution, and transports essential chemicals on which they rely for sensing, foraging, and mating. As a result, flow has a broad range of effects on the behaviors of microorganisms, including their locomotion, reproduction, nutrient uptake, and communication. Despite many efforts to understand microbiology in aquatic environments, it remains a challenge to interpret the physical and biological behaviors of microorganisms in the presence of fluid flows, particularly unsteady and chaotic flows.In this thesis, I investigate the interaction between motile microorganisms and dynamical structures in chaotic flows, and the effects of such interaction on transport and mixing. The flow dynamical structures investigated here are known as the Lagrangian coherent structures (LCSs). First, I characterize the transport and mixing in a spatially periodic chaotic flow with swimming Escherichia coli. The microorganisms are found to align and accumulate near structures of strong stretching of fluid parcels, or namely, the hyperbolic LCSs. Such alignment and accumulation of microorganisms lead to reduction in large-scale transport but enhancement in small-scale mixing. Second, I examine the transport and mixing with E. coli in a more complex spatially aperiodic chaotic flow. The microorganisms are found to escape and deplete in vortex-like dynamical structures known as the elliptic LCSs. The depletion leads to enhanced transport barriers into which the transport of diffusive chemicals is much slower. Lastly, I investigate the mixing in the self-generated chaotic flows of swarming Serratia marcescens and show that dilute polymers can substantially enhance mixing induced by collective behaviors. Overall, this dissertation elucidates the nontrivial effects of the interaction between microorganisms and flow structures on transport and mixing. 
일반주제명  
Condensed matter physics.
일반주제명  
Applied physics.
일반주제명  
Microbiology.
키워드  
Active matter
키워드  
Chaotic mixing
키워드  
Lagrangian coherent structures
키워드  
Escherichia coli
키워드  
Transport
기타저자  
University of Pennsylvania Mechanical Engineering and Applied Mechanics
기본자료저록  
Dissertations Abstracts International. 85-03B.
기본자료저록  
Dissertation Abstract International
전자적 위치 및 접속  
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MARC

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■006m          o    d                
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■020    ▼a9798380384674
■035    ▼a(MiAaPQ)AAI30528969
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a530
■1001  ▼aRan,  Ranjiangshang.
■24510▼aTransport  and  Mixing  With  Swimming  Microorganisms  in  Chaotic  Flows▼h[electronic  resource]
■260    ▼a[S.l.]:▼bUniversity  of  Pennsylvania.  ▼c2023
■260  1▼aAnn  Arbor  :▼bProQuest  Dissertations  &  Theses,  ▼c2023
■300    ▼a1  online  resource(111  p.)
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-03,  Section:  B.
■500    ▼aAdvisor:  Arratia,  Paulo  E.
■5021  ▼aThesis  (Ph.D.)--University  of  Pennsylvania,  2023.
■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
■520    ▼aMicroorganisms,  primitive  unicellular  forms  of  life,  form  the  basis  of  the  food  web  and  play  crucial  roles  in  the  Earth's  biogeochemical  cycles.  Habitats  of  microorganisms,  from  oceans  and  lakes  to  soil  and  human  intestines,  are  often  characterized  by  constant  fluid  motion.  Fluid  flow  exerts  forces  and  torques  on  microorganisms  that  affect  their  movement  and  distribution,  and  transports  essential  chemicals  on  which  they  rely  for  sensing,  foraging,  and  mating.  As  a  result,  flow  has  a  broad  range  of  effects  on  the  behaviors  of  microorganisms,  including  their  locomotion,  reproduction,  nutrient  uptake,  and  communication.  Despite  many  efforts  to  understand  microbiology  in  aquatic  environments,  it  remains  a  challenge  to  interpret  the  physical  and  biological  behaviors  of  microorganisms  in  the  presence  of  fluid  flows,  particularly  unsteady  and  chaotic  flows.In  this  thesis,  I  investigate  the  interaction  between  motile  microorganisms  and  dynamical  structures  in  chaotic  flows,  and  the  effects  of  such  interaction  on  transport  and  mixing.  The  flow  dynamical  structures  investigated  here  are  known  as  the  Lagrangian  coherent  structures  (LCSs).  First,  I  characterize  the  transport  and  mixing  in  a  spatially  periodic  chaotic  flow  with  swimming  Escherichia  coli.  The  microorganisms  are  found  to  align  and  accumulate  near  structures  of  strong  stretching  of  fluid  parcels,  or  namely,  the  hyperbolic  LCSs.  Such  alignment  and  accumulation  of  microorganisms  lead  to  reduction  in  large-scale  transport  but  enhancement  in  small-scale  mixing.  Second,  I  examine  the  transport  and  mixing  with  E.  coli  in  a  more  complex  spatially  aperiodic  chaotic  flow.  The  microorganisms  are  found  to  escape  and  deplete  in  vortex-like  dynamical  structures  known  as  the  elliptic  LCSs.  The  depletion  leads  to  enhanced  transport  barriers  into  which  the  transport  of  diffusive  chemicals  is  much  slower.  Lastly,  I  investigate  the  mixing  in  the  self-generated  chaotic  flows  of  swarming  Serratia  marcescens  and  show  that  dilute  polymers  can  substantially  enhance  mixing  induced  by  collective  behaviors.  Overall,  this  dissertation  elucidates  the  nontrivial  effects  of  the  interaction  between  microorganisms  and  flow  structures  on  transport  and  mixing. 
■590    ▼aSchool  code:  0175.
■650  4▼aCondensed  matter  physics.
■650  4▼aApplied  physics.
■650  4▼aMicrobiology.
■653    ▼aActive  matter
■653    ▼aChaotic  mixing
■653    ▼aLagrangian  coherent  structures
■653    ▼aEscherichia  coli
■653    ▼aTransport
■690    ▼a0611
■690    ▼a0215
■690    ▼a0410
■71020▼aUniversity  of  Pennsylvania▼bMechanical  Engineering  and  Applied  Mechanics.
■7730  ▼tDissertations  Abstracts  International▼g85-03B.
■773    ▼tDissertation  Abstract  International
■790    ▼a0175
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16933417▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
■980    ▼a202402▼f2024

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